High efficiency amp benefits WCDMA and OFDM designs

Nujira, the Cambridge, UK-based company developing advanced power amplifier technology, is demonstrating a new 20W multi-carrier WCDMA amplifier to its customers.

Nujira, the Cambridge, UK-based company developing advanced power amplifier technology is demonstrating a new 20W multi-carrier WCDMA amplifier to customers.

Nujira’s patent pending technology, which is suitable for both WCDMA and OFDM modulation schemes, can deliver amplifier efficiencies of 35%.

Nujira’s core technology advancement is the development of a modulator capable of delivering widely varying supply voltages and currents into an RF transistor load at very high accuracy and efficiency. The so called HAT (High Accuracy Tracking) system enables RF devices to be modulated on their drain in precise unison with the Radio Frequency envelope – the result being ultra high efficiency. This modulator is found at the heart of Envelope Tracking or Envelope Elimination and Restoration systems.

Tim Haynes, Nujira’s CEO, said: “We are demonstrating a 20W multi-carrier WCDMA amplifier using high accuracy envelope tracking. Delivering modulator efficiencies of over 90% at such high bandwidths and RF powers is the most difficult of scenarios. Even in these extreme cases, efficiencies three times those of existing products are achievable.”

Nujira further claims that their efficient power amplifier technology is both frequency agnostic and scaleable for different power levels, and as such is suitable for many systems, including the WiMAX standard. Samples of Nujira’s modulator technology will be available for selected customers in Q3 2004, with production units available in 2005.

The first products have been designed for Power Amplifier vendors and OEMs for high power cellular infrastructure applications.

A complete WCDMA PA reference design with lineariser will be available in Q4 2004.

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